Mayfield Lake is a reservoir established by the construction of Mayfield Dam. Prior to construction of the dam, the Tilton River joined forces with the Cowlitz River within this landscape. The dam, designed to forge the energy of this river confluence into electricity, was originally proposed in 1948. After 15 years of legal struggles, which ended in a U.S. Supreme Court decision, it was constructed and became operational in 1963. In this same year, Washington State Parks began to manage recreation along its shorelines.
The original name of the park was Mayfield Lake State Park. However, in 1971 the name was changed to Ike Kinswa State Park in honor of Ike Kinswa, a well-respected Cowlitz Indian who lived along the shores of the rivers’ confluence. Over the years the park has grown in popularity as a camping and water recreation destination in central Lewis County.